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  <title>从结果集中取得一行作为关联数组</title>
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  <div id="layout-content"><div id="function.mysql-fetch-assoc" class="refentry">
   <div class="refnamediv">
    <h1 class="refname">mysql_fetch_assoc</h1>
    <p class="verinfo">(PHP 4 &gt;= 4.0.3, PHP 5)</p><p class="refpurpose"><span class="refname">mysql_fetch_assoc</span> &mdash; <span class="dc-title">
     从结果集中取得一行作为关联数组
    </span></p>

   </div>
 
 <div id="function.mysql-fetch-assoc-refsynopsisdiv">
  <div class="warning"><strong class="warning">Warning</strong>
   <p class="para">本扩展自 PHP 5.5.0
起已废弃，并在自 PHP 7.0.0 开始被移除。应使用 <a href="book.mysqli.html" class="link">MySQLi</a>
或 <a href="ref.pdo_mysql.html" class="link">PDO_MySQL</a> 扩展来替换之。参见
<a href="mysqlinfo.api.choosing.html" class="link">MySQL：选择 API</a> 指南以及<a href="faq.databases.html#faq.databases.mysql.deprecated" class="link">相关 FAQ</a> 来获取更多信息。用以替代本函数的有：</p>
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="mysqli_result.fetch_assoc.html" class="function">mysqli_fetch_assoc()</a></span></li>
    <li class="member"><span class="methodname"><a href="pdostatement.fetch.html" class="methodname">PDOStatement::fetch(PDO::FETCH_ASSOC)</a></span></li>
   </ul>
  </div>
 </div>
 
 <div class="refsect1 description" id="refsect1-function.mysql-fetch-assoc-description">
  <h3 class="title">说明</h3>
     <div class="methodsynopsis dc-description">
      <span class="methodname"><strong>mysql_fetch_assoc</strong></span>
       ( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$result</code></span>
      ) : <span class="type">array</span></div>

    <p class="para rdfs-comment">
     返回对应结果集的关联数组，并且继续移动内部数据指针。
     <span class="function"><strong>mysql_fetch_assoc()</strong></span> 和用
     <span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span> 加上第二个可选参数 
     MYSQL_ASSOC 完全相同。它仅仅返回关联数组。
    </p>
   </div>


 <div class="refsect1 parameters" id="refsect1-function.mysql-fetch-assoc-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    <dt>
<code class="parameter">
result</code></dt>
<dd>
<p class="para"><span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>
型的结果集。此结果集来自对 <span class="function"><a href="mysql_query.html" class="function">mysql_query()</a></span>
的调用。</p></dd>

   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.mysql-fetch-assoc-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
    返回根据从结果集取得的行生成的关联数组；如果没有更多行则返回 <strong><code>FALSE</code></strong>。
  </p>
  <p class="para">
   如果结果中的两个或以上的列具有相同字段名，最后一列将优先。要访问同名的其它列，要么用
     <span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>
     来取得数字索引或给该列起个别名。
     参见
     <span class="function"><a href="mysql_fetch_array.html" class="function">mysql_fetch_array()</a></span> 例子中有关别名说明。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.mysql-fetch-assoc-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2138">
    <p><strong>Example #1 扩展的 <span class="function"><strong>mysql_fetch_assoc()</strong></span> 例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$conn&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysql_connect</span><span style="color: #007700">(</span><span style="color: #DD0000">"localhost"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"mysql_user"</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"mysql_password"</span><span style="color: #007700">);<br /><br />if&nbsp;(!</span><span style="color: #0000BB">$conn</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Unable&nbsp;to&nbsp;connect&nbsp;to&nbsp;DB:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br />&nbsp;&nbsp;&nbsp;&nbsp;exit;<br />}<br />&nbsp;&nbsp;<br />if&nbsp;(!</span><span style="color: #0000BB">mysql_select_db</span><span style="color: #007700">(</span><span style="color: #DD0000">"mydbname"</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Unable&nbsp;to&nbsp;select&nbsp;mydbname:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br />&nbsp;&nbsp;&nbsp;&nbsp;exit;<br />}<br /><br /></span><span style="color: #0000BB">$sql&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"SELECT&nbsp;id&nbsp;as&nbsp;userid,&nbsp;fullname,&nbsp;userstatus&nbsp;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FROM&nbsp;&nbsp;&nbsp;sometable<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;WHERE&nbsp;&nbsp;userstatus&nbsp;=&nbsp;1"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$result&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysql_query</span><span style="color: #007700">(</span><span style="color: #0000BB">$sql</span><span style="color: #007700">);<br /><br />if&nbsp;(!</span><span style="color: #0000BB">$result</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"Could&nbsp;not&nbsp;successfully&nbsp;run&nbsp;query&nbsp;(</span><span style="color: #0000BB">$sql</span><span style="color: #DD0000">)&nbsp;from&nbsp;DB:&nbsp;"&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">mysql_error</span><span style="color: #007700">();<br />&nbsp;&nbsp;&nbsp;&nbsp;exit;<br />}<br /><br />if&nbsp;(</span><span style="color: #0000BB">mysql_num_rows</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">)&nbsp;==&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"No&nbsp;rows&nbsp;found,&nbsp;nothing&nbsp;to&nbsp;print&nbsp;so&nbsp;am&nbsp;exiting"</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;exit;<br />}<br /><br /></span><span style="color: #FF8000">//&nbsp;While&nbsp;a&nbsp;row&nbsp;of&nbsp;data&nbsp;exists,&nbsp;put&nbsp;that&nbsp;row&nbsp;in&nbsp;$row&nbsp;as&nbsp;an&nbsp;associative&nbsp;array<br />//&nbsp;Note:&nbsp;If&nbsp;you're&nbsp;expecting&nbsp;just&nbsp;one&nbsp;row,&nbsp;no&nbsp;need&nbsp;to&nbsp;use&nbsp;a&nbsp;loop<br />//&nbsp;Note:&nbsp;If&nbsp;you&nbsp;put&nbsp;extract($row);&nbsp;inside&nbsp;the&nbsp;following&nbsp;loop,&nbsp;you'll<br />//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;then&nbsp;create&nbsp;$userid,&nbsp;$fullname,&nbsp;and&nbsp;$userstatus<br /></span><span style="color: #007700">while&nbsp;(</span><span style="color: #0000BB">$row&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">mysql_fetch_assoc</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"userid"</span><span style="color: #007700">];<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"fullname"</span><span style="color: #007700">];<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">$row</span><span style="color: #007700">[</span><span style="color: #DD0000">"userstatus"</span><span style="color: #007700">];<br />}<br /><br /></span><span style="color: #0000BB">mysql_free_result</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.mysql-fetch-assoc-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <strong>性能</strong><br />
   <p class="para">
    必须指出一个要点：
     <span class="function"><strong>mysql_fetch_assoc()</strong></span> 比
     <span class="function"><a href="mysql_fetch_row.html" class="function">mysql_fetch_row()</a></span>
     并<em class="emphasis">不明显</em> 
     慢，而且还提供了更多有用的值。
   </p>
  </p></blockquote>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数返回的字段名<em class="emphasis">大小写敏感</em>。</span></p></blockquote>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数将 NULL 字段设置为 PHP <strong><code>NULL</code></strong> 值。</span></p></blockquote>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.mysql-fetch-assoc-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="mysql_fetch_row.html" class="function" rel="rdfs-seeAlso">mysql_fetch_row()</a> - 从结果集中取得一行作为枚举数组</span></li>
    <li class="member"><span class="function"><a href="mysql_fetch_array.html" class="function" rel="rdfs-seeAlso">mysql_fetch_array()</a> - 从结果集中取得一行作为关联数组，或数字数组，或二者兼有</span></li>
    <li class="member"><span class="function"><a href="mysql_data_seek.html" class="function" rel="rdfs-seeAlso">mysql_data_seek()</a> - 移动内部结果的指针</span></li>
    <li class="member"><span class="function"><a href="mysql_query.html" class="function" rel="rdfs-seeAlso">mysql_query()</a> - 发送一条 MySQL 查询</span></li>
    <li class="member"><span class="function"><a href="mysql_error.html" class="function" rel="rdfs-seeAlso">mysql_error()</a> - 返回上一个 MySQL 操作产生的文本错误信息</span></li>
   </ul>
  </p>
 </div>

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